Accessibility of spoken, written, and sign language in Landau-Kleffner syndrome: a linguistic and functional MRI study.

Landau-Kleffner syndrome (LKS) is an acquired aphasia which begins in childhood and is thought to arise from an epileptic disorder within the auditory speech cortex. Although the epilepsy usually subsides at puberty, a severe communication impairment often persists. Here we report on a detailed study of a 26-year old, left-handed male, with onset of LKS at age 5 years, who is aphasic for English but who learned British Sign Language (BSL) at age 13. We have investigated his skills in different language modalities, recorded EEGs during wakefulness, sleep, and under conditions of auditory stimulation, measured brain stem auditory-evoked potentials (BAEP), and performed functional MRI (fMRI) during a range of linguistic tasks. Our investigation demonstrated severe restrictions in comprehension and production of spoken English as well as lip-reading, while reading was comparatively less impaired. BSL was by far the most efficient mode of communication. All EEG recordings were normal, while BAEP showed minor abnormalities. fMRI revealed: 1) powerful and extensive bilateral (R > L) activation of auditory cortices in response to heard speech, much stronger than when listening to music; 2) very little response to silent lip-reading; 3) strong activation in the temporo-parieto-occipital association cortex, exclusively in the right hemisphere (RH), when viewing BSL signs. Analysis of these findings provides novel insights into the disturbance of the auditory speech cortex which underlies LKS and its diagnostic evaluation by fMRI, and underpins a strategy of restoring communication abilities in LKS through a natural sign language of the deaf (with Video)

Why do mothers cradle babies on their left?

Many explanations have been put forward for the observed preference of mothers to cradle babies on the left side. These include handedness, the importance of the maternal heartbeat, left breast sensitivity, socio-psychological factors, and advantages in monitoring the infant. We propose that protection and facilitation of affective communication is at the core of cradling; and explore the relation between left-cradling and the role of the right hemisphere in early mother-infant interaction. Left-cradling not only directs maternal communication to the infant's right hemisphere but also facilitates affective feedback to the maternal right brain. The underlying neuro-linguistic mechanisms proposed in this article may be important in the early course of child language development and may also serve to illuminate our understanding of the evolution of human language.

Filter paper cortisol profiles in secondary adrenocortical insufficiency.

The use of filter paper four point 24 hour cortisol profiles in the diagnosis and management of secondary adrenocortical deficiency was examined. Eighteen children with familial short stature and isolated growth hormone deficiency had normal 24 hour and morning plasma cortisol concentrations measured. Eight of 11 children with multiple pituitary hormone deficiencies had evidence of hypocorticalism despite previously normal baseline cortisols or responses to insulin hypoglycaemia or tetracosactrin. Nine of 11 children with hypopituitarism on replacement treatment (4.9-12.5 mg/m2/day) had satisfactory concentrations of cortisol, though morning cortisols were often low. Filter paper profiles are a simple, inexpensive, and relatively non-invasive way of managing children with suspected hypocorticalism and of monitoring their treatment.